Text box dynamically in a Gridview in Asp.net:-

        <asp:GridView ID="GridView5" runat="server" CellPadding="4"
        EnableModelValidation="True" Width="1115px" AutoGenerateColumns="False"            
        BackColor="White" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px">
        <FooterStyle BackColor="#99CCCC" ForeColor="#003399" />
        <HeaderStyle BackColor="#003399" Font-Bold="True" ForeColor="#CCCCFF" />
        <PagerStyle BackColor="#99CCCC" ForeColor="#003399" HorizontalAlign="Left" />
        <RowStyle BackColor="White" ForeColor="#003399" />
        <SelectedRowStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />
        <Columns>
        <asp:TemplateField HeaderText="ID">
        <ItemTemplate>
        <asp:Label ID="CId3" runat="server" Text=''> </asp:Label>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Student Name">
        <ItemTemplate>
        <asp:Label ID="CName3" runat="server" Text='' Width="120"></asp:Label>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Return">
        <ItemTemplate>
        <asp:TextBox ID="TextBox36" runat="server" Width="60px"></asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="1Mile/800 Meter">
        <ItemTemplate>
        <asp:TextBox ID="TextBox37" runat="server" Width="60px">
        </asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Marks">
        <ItemTemplate>
        <asp:TextBox ID="TextBox38" runat="server" Width="60px" >
        </asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Long Jump">
        <ItemTemplate>
        <asp:TextBox ID="TextBox39" runat="server" Width="60px"></asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Marks">
        <ItemTemplate>
        <asp:TextBox ID="TextBox40" runat="server" Width="60px"></asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="High Jump">
        <ItemTemplate>
        <asp:TextBox ID="TextBox41" runat="server" Width="60px"></asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Mark">
        <ItemTemplate>
        <asp:TextBox ID="TextBox42" runat="server" Width="60px">
        </asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Interview">
        <ItemTemplate>
 <asp:TextBox ID="TextBox43" runat="server" Width="60px"     
 onblur="validateField3(this)">
        </asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Total">
        <ItemTemplate>
        <asp:TextBox ID="TextBox44" runat="server" Width="60px" Enabled="false">
        </asp:TextBox>
        </ItemTemplate>
        </asp:TemplateField>
        </Columns>
        </asp:GridView>

 

Codes for JavaScript:-

<script language ="javascript" type="text/javascript">
      function validateField3(fieldname)
      {
          if ((fieldname.value) && (!fieldname.value.match(" ")))
          {
            var str = fieldname.id1;
            document.getElementById(fieldname.id.replace("43", "44")).value =   
            parseInt(document.getElementById(fieldname.id.replace("43", "36")).value) +     
            parseInt(document.getElementById(fieldname.id.replace("43", "38")).value) + 
            parseInt(document.getElementById(fieldname.id.replace("43", "40")).value) + 
            parseInt(document.getElementById(fieldname.id.replace("43", "42")).value) + 
            parseInt(document.getElementById(fieldname.id.replace("43", "43")).value);
          }
        }   
    </script>

Data bind:-


protected void Button3_Click(object sender, EventArgs e)

{


       DataAccess da = new DataAccess();
       da.OpenConnection();
       string id;
       foreach (GridViewRow row in GridView5.Rows)
        {
         string c = ddmonth.SelectedValue.ToString() + "/"   
                    + ddday.SelectedValue.ToString() + "/"
                    + ddyear.SelectedValue.ToString();
               id = ((Label)row.FindControl("Cid3")).Text;
          TextBox text36 = (TextBox)row.FindControl("TextBox36");
          TextBox text37 = (TextBox)row.FindControl("TextBox37");
          TextBox text38 = (TextBox)row.FindControl("TextBox38");
          TextBox text39 = (TextBox)row.FindControl("TextBox39");
          TextBox text40 = (TextBox)row.FindControl("TextBox40");
          TextBox text41 = (TextBox)row.FindControl("TextBox41");
          TextBox text42 = (TextBox)row.FindControl("TextBox42");
          TextBox text43 = (TextBox)row.FindControl("TextBox43");
          TextBox text44 = (TextBox)row.FindControl("TextBox44");
           
       if (text36 .Text !="" && text37 .Text !="" && text38 .Text  !="" && text39 .Text !="" && text40 .Text !="" && text41 .Text !="" && text42 .Text !="" && text43 .Text !="")
      {
       try
        {
         double sa = (double.Parse(text36.Text) +     double.Parse(text38.Text) + double.Parse(text40.Text) + double.Parse(text42.Text) + double.Parse(text43.Text));
         da.ExecuteNonQuery("Insert into PhysicalPractice(id,pdate,Rtnmarks,Atasemeter,mark1,Longjump,mark4,Highjump,mark5,interview,total) values('" + id + "','" + c + "','" +text36 .Text + "','" +text37 .Text + "','" +text38 .Text + "','" +text39 .Text  + "','" +text40 .Text + "','" +text41 .Text + "','" +text42 .Text + "','" +text43 .Text + "','" + sa.ToString() + "')");
         lbl_msg4.Text = "Record Save successfully";
         }
         catch (Exception ex)
         {
           Response.Write(ex.Message);
         }
         }
         else
         {
          lbl_msg4.Text = "Please enter all inforamation";
         }

        }

    }

}